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There's no starter relay...there's a starter solenoid on the starter itself.
Are you having a problem getting it to turn over?
If it's a manual transmission car then the signal goes from the ignition switch thru the clutch safety switch and then to the starter solenoid. If it's an automatic, it goes from the ign switch thru the neutral safety switch on the transmission then to the starter solenoid.
Ford has never used starter relays. Only inner fender mounted starter solenoids which eventually became obsolete in favor of starter mounted solenoids.